Petrogenesis of a voluminous Quaternary adakitic volcano: the case of Baru volcano

Hidalgo, Paulo J.; Rooney, Tyrone O.

doi:10.1007/s00410-014-1011-9

Cited by 22 publications

(21 citation statements)

References 112 publications

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“…Rather, the adjacent Cordillera Central of Panama likewise exhibits 7-8 Ma plutons that core abandoned arc edifices (CCP, Figure 1) [Wegner et al, 2010]. While Quaternary adakitic volcanism is documented among a few isolated volcanoes in the Cordillera Central of Panama [Hidalgo and Rooney, 2010;Hidalgo et al, 2011;Hidalgo and Rooney, 2014], calc-alkaline products associated with this range are no younger than 7-8 Ma [Wegner et al, 2010]. Therefore, calc-alkaline volcanism within both the Cordillera Central of Panama and the Cordillera de Talamanca went extinct at the same time during the late Miocene (CCP, CT, Figure 1).…”

Section: Cocos Ridge Subduction and Cessation Of Calc-alkaline Volcanmentioning

confidence: 99%

Late Miocene to recent plate tectonic history of the southern Central America convergent margin

Morell

2015

Geochem Geophys Geosyst

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New plate reconstructions constrain the tectonic evolution of the subducting Cocos and Nazca plates across the southern Central American subduction zone from late Miocene to recent. Because of the strong relationships between lower and upper (Caribbean) plate dynamics along this margin, these constraints have wide‐ranging implications for the timing and growth of upper plate deformation and volcanism in southern Central America. The reconstructions outline three important events in the Neogene history of this margin: (1) the coeval development of the Panama Triple Junction with the initiation of oblique subduction of the Nazca plate at ∼8.5 Ma; (2) the initiation of seamount and rough crust subduction beginning at ∼3–4 Ma; and (3) Cocos Ridge subduction from ∼2 to 3 Ma. A comparison of these events with independent geologic, geomorphic, volcanic, and stratigraphic data sets reveals that the timing, rates, and origin of subducting crust directly impacted the Neogene growth of upper plate deformation and volcanism in southern Central America. These analyses constrain the timing, geometry, and causes of a number of significant tectonic and volcanic processes, including rapid Plio‐Quaternary arc‐fore arc contraction due to Cocos Ridge subduction, the detachment of the Panama microplate at ∼1–3 Ma, and the late Miocene cessation of mantle‐wedge‐derived volcanism across ∼300 km of the subduction zone.

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Section: Cocos Ridge Subduction and Cessation Of Calc-alkaline Volcanmentioning

confidence: 99%

Late Miocene to recent plate tectonic history of the southern Central America convergent margin

Morell

2015

Geochem Geophys Geosyst

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“…One alternative mechanism may be the remelting of basalts or mafic cumulates near the base of the crust, while another less likely scenario is the high pressure crystallization differentiation of wedge derived calc-alkaline hydrous basaltic magmas. A recent study by Hidalgo and Rooney (2014) concludes that the Baru Volcano, located in Panama close to the border with Costa Rica (Fig. 5), is adakitic and that its petrogenesis is more consistent with flux induced mantle melting than with melting of the subducting crust.…”

Section: Alternative Modelmentioning

confidence: 99%

Density structure and geometry of the Costa Rican subduction zone from 3-D gravity modeling and local earthquake data

Lücke

Arroyo

2015

Solid Earth

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Abstract. The eastern part of the oceanic Cocos Plate presents a heterogeneous crustal structure due to diverse origins and ages as well as plate-hot spot interactions which originated the Cocos Ridge, a structure that converges with the Caribbean Plate in southeastern Costa Rica. The complex structure of the oceanic plate directly influences the dynamics and geometry of the subduction zone along the Middle American Trench. In this paper an integrated interpretation of the slab geometry in Costa Rica is presented based on 3-D density modeling of combined satellite and surface gravity data, constrained by available geophysical and geological data and seismological information obtained from local networks. The results show the continuation of steep subduction geometry from the Nicaraguan margin into northwestern Costa Rica, followed by a moderate dipping slab under the Central Cordillera toward the end of the Central American Volcanic Arc. Contrary to commonly assumed, to the southeast end of the volcanic arc, our preferred model shows a steep, coherent slab that extends up to the landward projection of the Panama Fracture Zone. Overall, a gradual change in the depth of the intraplate seismicity is observed, reaching 220 km in the northwestern part, and becoming progressively shallower toward the southeast, where it reaches a maximum depth of 75 km. The changes in the terminal depth of the observed seismicity correlate with the increased density in the modeled slab. The absence of intermediate depth (> 75 km) intraplate seismicity in the southeastern section and the higher densities for the subducted slab in this area, support a model in which dehydration reactions in the subducted slab cease at a shallower depth, originating an anhydrous and thus aseismic slab.

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“…SiO 2 expressed in weight percent. Data sources: Panama adakites [ Hidalgo and Rooney , ; Wegner et al ., ; Gazel et al ., ]; Canal Zone <24 Ma [ Farris et al ., ]; Cordellerian arc [ Wegner et al ., ; Gazel et al ., ]. (c) Variation of Sr/Y (an indicator of adakite signatures) as a function of differentiation for suites in Panama.…”

Section: Discussionmentioning

confidence: 99%

“…To the southeast of the Cordillera de Talamanca, the Cordillera Central of Western Panama (CCP, Figure 1) (Cordilleran arc [Wegner et al, 2011]) extends just beyond El Valle Volcano (EVV, Figure 1) to Cerro Trinidad, and lies inboard of the Nazca plate (NZ, Figure 1), which subducts beneath the Panama block at a highly oblique angle and at a rate of 40 mm/yr [DeMets et al, 2010] and is separated from the Cocos Plate by the N-S striking Panama Fracture Zone (PFZ, Figure 1). Most of the Cordillera Central of western Panama is now magmatically inactive [Defant et al, 1991b], save for three volcanic centers: Bar u, La Yeguada, and El Valle [Defant et al, 1991b;Sherrod et al, 2007;Hidalgo and Rooney, 2010;Hidalgo et al, 2011;Hidalgo and Rooney, 2014]. The Panama Canal Zone lies at the easternmost extent of the Cordillera Central, to the east-northeast of El Valle volcano.…”

Section: Distribution Of Active Volcanism and Current Plate Tectonic mentioning

confidence: 99%

Magmatic consequences of the transition from orthogonal to oblique subduction in Panama

Rooney

Morell

Hidalgo

et al. 2015

Geochem Geophys Geosyst

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The closure of the Central American Seaway is linked with tectonic and magmatic processes that have controlled the evolution of the Isthmus of Panama. We focus on the terminal stages of arc activity in the Central Panama region, and present new geochemical data from ∼9 Ma explosive silicic volcanism preserved in three syngenetic tuff beds from the Gatun. The magmatic evolution of the Gatun Formation is controlled by a series of magma mushes where pyroxene is the dominant early forming mafic mineral, with amphibole appearing only relatively late in the fractionation sequence. Our data show Gatun lavas exhibit a strong subduction signature, consistent with plate reconstruction models showing arc‐normal subduction from Costa Rica to Panama pre‐8.5 Ma. However, large ion lithophile elements are depleted in the Gatun Formation in comparison to other regional suites, indicative of a lower flux of subduction fluid to the Gatun Formation mantle source, which is explained by a shift toward magma generation by decompression following the collision of the arc with South America. Oblique subduction commencing ∼8.5 Ma resulted in the shutdown of normal arc activity throughout Panama. We interpret subsequent regional Quaternary adakitic volcanism as a response to this oblique subduction. The now more refractory mantle wedge required greater fluid flux in order to melt. The resultant volatile‐rich melts were more prone to deep fractionation of amphibole and garnet cumulates forming adakites. Deep fractionation was potentially enhanced by changing stress regimes on the upper plate caused by oblique subduction.

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Petrogenesis of a voluminous Quaternary adakitic volcano: the case of Baru volcano

Cited by 22 publications

References 112 publications

Late Miocene to recent plate tectonic history of the southern Central America convergent margin

Late Miocene to recent plate tectonic history of the southern Central America convergent margin

Density structure and geometry of the Costa Rican subduction zone from 3-D gravity modeling and local earthquake data

Magmatic consequences of the transition from orthogonal to oblique subduction in Panama

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